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How many permutations of 3 different digits are there, chosen from the ten digits 0 to 9 inclusive?
How many digits in a fed referemce number?
How many strings of three digits are there? 000 to 999, or a total of 1000. How many strings of three digits contain the same three digits? That's 000, 111, 222 ... 999! ten in total. The difference is your answer: 1000-10 = 990.
TWO digits are in the number 30, 3 and 0
The hexadecimal system is base 16.